US11962102B2 - Multi-band stamped sheet metal antenna - Google Patents
Multi-band stamped sheet metal antenna Download PDFInfo
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- US11962102B2 US11962102B2 US17/746,470 US202217746470A US11962102B2 US 11962102 B2 US11962102 B2 US 11962102B2 US 202217746470 A US202217746470 A US 202217746470A US 11962102 B2 US11962102 B2 US 11962102B2
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 52
- 239000002184 metal Substances 0.000 title claims abstract description 52
- 238000004382 potting Methods 0.000 description 24
- 150000001875 compounds Chemical class 0.000 description 9
- 230000005540 biological transmission Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004593 Epoxy Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- -1 for example Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 230000001154 acute effect Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 229910001092 metal group alloy Inorganic materials 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 230000037361 pathway Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/44—Resonant antennas with a plurality of divergent straight elements, e.g. V-dipole, X-antenna; with a plurality of elements having mutually inclined substantially straight portions
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
- H01Q5/364—Creating multiple current paths
- H01Q5/371—Branching current paths
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
- H01Q1/2233—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems used in consumption-meter devices, e.g. electricity, gas or water meters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/246—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for base stations
Definitions
- Dipole antennas are commonly used for wireless communications.
- a dipole antenna typically includes two identical conductive elements to which a driving current from a transmitter is applied, or from which a received wireless signal is applied to a receiver.
- a dipole antenna most commonly includes two conductors of equal length oriented end-to-end with a feedline connected between them.
- a dipole antenna's radiation pattern is typically omnidirectional in a plane perpendicular to the wire axis, with the radiation falling to zero off the ends of the antenna.
- FIGS. 1 A and 1 B depict different three-dimensional views of a dipole antenna structure according to an exemplary implementation
- FIG. 2 illustrates components of the dipole antenna structure of the exemplary implementation of FIGS. 1 A and 1 B ;
- FIG. 3 shows components of the cantilevered structure of the dipole antenna structure of FIGS. 1 A and 1 B ;
- FIGS. 4 A- 4 C illustrate views of an example of the dipole antenna structure that show dimensions associated with, and relative angles between surfaces of, the various structures of the dipole antenna structure formed in the metal sheet;
- FIG. 5 illustrates interconnection of the dipole antenna structure with a Printed Circuit Board (PCB);
- PCB Printed Circuit Board
- FIG. 6 shows a wireless device that includes a device housing inside of which the dipole antenna structure and the PCB may be placed;
- FIG. 7 further depicts a cutaway view of the internal space of the wireless device of FIG. 6 , with one example of an internal arrangement of the dipole antenna structure, the PCB, and other components;
- FIG. 8 illustrates an example of the use of PCB potting to protect the PCB, and other components of the wireless device of FIG. 6 , in addition to providing mechanical support for the dipole antenna structure;
- FIGS. 9 A and 9 B depict plots of Voltage Standing Wave Ratio versus frequency for an exemplary implementation of the dipole antenna structure.
- a multi-band dipole antenna structure may be formed from a sheet of metal (e.g., a single sheet of stamped metal) that may include multiple arms.
- the multiple arms may include two dipole arms formed non-parallel to, and co-planar with, one another and connected to a cantilever beam that cantilevers the two dipole arms out and away from an underlying PCB to which the antenna is connected.
- the two dipole arms may be formed at an angle ⁇ relative one another, where the angle ⁇ falls within the range 0> ⁇ >180 degrees.
- the sheet of metal of the dipole antenna structure may further include a feed connection, a ground connection, and one or more antenna impedance matching elements that either directly or indirectly connect to the two dipole arms.
- the antenna impedance matching elements can be embedded in the sheet metal structure of the dipole antenna, no discrete matching components may need to be disposed on the PCB, thus, reducing the size and cost of the PCB.
- the at least two arms of the dipole antenna facilitate multi-band tuning, where the shape and size of a first arm can be “tuned” to set a lower frequency band of the antenna, and the shape and size of a second arm can be “tuned” to set a higher frequency band of the antenna.
- the first arm may be tuned to cause the antenna to resonate at a first, lower frequency band
- the second arm may be tuned to cause the antenna to resonate at a second, higher frequency band.
- a portion of the antenna structure's sheet metal may be formed as a cantilevered structure that cantilevers the arms of the dipole antenna out and away from the underlying PCB to which the antenna structure is connected.
- the cantilevered structure of the dipole antenna structure enables the lower portion of the antenna structure to be submerged or formed within a layer of PCB potting compound (e.g., epoxy, resin, polyurethane, silicone) to protect the underlying PCB and to provide additional mechanical support to the dipole antenna structure, while at the same time permitting the antenna's dipole arms to extend above the layer of PCB potting compound so as to minimize the effect of the PCB potting upon the frequency response of the dipole antenna.
- PCB potting compound e.g., epoxy, resin, polyurethane, silicone
- the dipole antenna structure described herein may be used in, for example, a meter such as a utility meter (e.g., a water meter or power usage meter) to transmit and receive data (e.g., meter readings, requests for meter readings, etc.).
- a utility meter e.g., a water meter or power usage meter
- the antenna structure may be a component of a meter interface unit within the utility meter that enables wireless communication to/from the utility meter in multiple different frequency bands (e.g., Long-Term Evolution (LTE) bands, Industrial, Scientific, and Medical (ISM) bands, or BluetoothTM bands).
- LTE Long-Term Evolution
- ISM Industrial, Scientific, and Medical
- the compact nature of the dipole antenna structure requiring the use of no external, discrete impedance matching components (e.g., no impedance matching components disposed on an external PCB), enables the antenna to be fit within the physical constraints of existing meter interface units, and/or more easily fit within newly designed meter interface units that may be relatively small in size.
- no external, discrete impedance matching components e.g., no impedance matching components disposed on an external PCB
- FIGS. 1 A and 1 B depict different three-dimensional views of a dipole antenna structure 100 according to an exemplary implementation.
- the dipole antenna structure 100 is formed from a sheet of metal 110 that, in one implementation, may be stamped into the shape depicted in FIGS. 1 A and 1 B .
- the dipole antenna structure 100 is shown in FIGS. 1 A and 1 B as including a single sheet of metal 110 that forms one or more elements of an overall antenna.
- the sheet of metal 110 may form multiple radiating elements (i.e., multiple dipole arms) and may possibly form one or more other elements of the overall antenna, such as, for example, an impedance matching element, a feed connection element, and/or a ground connection element.
- the overall antenna described herein may include dipole antenna structure 100 , formed from sheet metal 110 as shown in FIGS. 1 A and 1 B , and may additionally include other antenna elements that are disposed on the PCB.
- the entirety of the antenna thus, may include the dipole antenna structure 100 and the PCB.
- the sheet of metal 110 used to form the dipole antenna structure 100 may have a uniform thickness ranging from 0.7 mm to 1.0 mm. In one implementation, the sheet of metal 110 may have a uniform thickness of 0.85 mm.
- the sheet of metal 100 may be formed in the shape of the dipole antenna 100 , shown in FIGS. 1 A and 1 B , using a forging technique, or other metal working technique.
- the sheet of metal 110 may be formed from one or more types of metal and/or metal alloys, such as, for example, copper or aluminum.
- FIG. 2 illustrates components of the dipole antenna structure 100 of the exemplary implementation of FIGS. 1 A and 1 B .
- dipole antenna structure 100 may include a first dipole arm 200 , a second dipole arm 205 , and a cantilevered structure 210 that includes, among other components, a ground connection 215 and a feed connection 220 .
- the first dipole arm 200 may be formed non-parallel to, and co-planar with, the second dipole arm 205 from the sheet of metal 110 .
- the cantilevered structure 210 of the dipole antenna structure 100 extends downwards from the portion of the sheet metal that includes the first dipole arm 200 and the second dipole arm 205 .
- the cantilevered structure 210 includes a cantilever beam or surface 225 that serves to cantilever the first dipole arm 200 and the second dipole arm 205 away from the underlying PCB (not shown) to which the dipole antenna structure 100 is connected. Further details of the shapes and sizes of the components of the dipole antenna structure 100 are described below with respect to 4 A- 4 C.
- FIG. 3 shows components of the cantilevered structure 210 of the dipole antenna structure 100 , and the cantilevered structure 210 's interconnection with the antenna's dipole arms 200 and 205 .
- the cantilevered structure 210 may include antenna impedance matching elements that enable antenna impedance matching, but also provide cantilevered structural support for the dipole arms 200 and 205 .
- cantilevered structure 210 includes a vertical arm support beam 300 having a first end that connects to first dipole arm 200 and second dipole arm 205 and a second end that connects to an underlying cantilever beam 225 .
- Cantilever beam 225 extends approximately perpendicularly out from arm support beam 300 (e.g., at a right angle to support beam 300 ) to create cantilevered structural support for the dipole arms 200 and 205 .
- Cantilever beam 225 further connects to ground connection 215 (via ground line 305 ) and feed connection 220 (via feed line 310 ) which, when attached to the PCB (e.g., soldered into the PCB), serve to hold and support the entire dipole antenna 100 in a vertical position.
- Ground connection 215 connects to ground line 305 , which further forms a circuitous electrical pathway between ground connection 215 and a connection to arm support beam 300 and cantilever beam 225 .
- Feed connection 220 connects to feed line 310 , which electrically connects to the cantilever beam 225 and to arm support beam 300 .
- An impedance matching element 315 connects to an outer edge of the cantilever beam 225 .
- a size and shape of impedance matching element 315 may be adjusted to tune the impedance of the dipole antenna 100 .
- the size and shape of cantilever beam 225 , arm support beam 300 , ground line 305 , and feed line 310 may also be adjusted to tune the impedance of the dipole antenna structure 100 .
- Other components may also be adjusted to tune the impedance of the dipole antenna structure 100 , including modifying the dimensions of first dipole arm 200 and second dipole arm 205 and modifying placement of the dipole antenna structure 100 on the PCB board to which it connects.
- FIGS. 4 A- 4 C illustrate views of an example of dipole antenna structure 100 that show dimensions associated with, and relative angles between surfaces of, the various structures/components of the dipole antenna structure 100 formed in the metal sheet 110 .
- FIG. 4 A shows a two-dimensional perspective of dipole antenna structure 100 that corresponds to “View A” indicated in FIG. 1 A
- FIG. 4 B shows a two-dimensional perspective of dipole antenna structure 100 that corresponds to “View B” indicated in FIG. 1 A
- FIG. 4 C shows a two-dimensional perspective of dipole antenna structure 100 that corresponds to “View C” indicated in FIG. 1 A .
- the first dipole arm 200 ( FIG. 4 A ) may be formed in the sheet of metal 110 co-planar with the second dipole arm 205 .
- the first dipole arm 200 may be formed non-parallel to the second dipole arm 205 , with an angle ⁇ 1 ( FIG. 4 A ) formed between a first line that extends through a substantial length of first dipole arm 200 and a second line that extends through a substantial length of second dipole arm 205 .
- the first line through first dipole arm 200 is parallel to linear edges of the upper surface of arm 200
- the second line through second dipole arm 205 is parallel to linear edges of the upper surface of arm 205 .
- ⁇ 1 is equal to 90 degrees. However, in other implementations, ⁇ 1 may range from greater than 0 degrees to less than 180 degrees (0 ⁇ 1 ⁇ 180). ⁇ 1 , thus, may be an acute angle, a right angle, or an obtuse angle.
- the first dipole arm 200 may be formed in a “dogleg” configuration, having a horizontal surface 400 ( FIG. 4 B ) and a vertical surface 405 ( FIG. 4 B ) that is formed at the outer edge of horizontal surface 400 of arm 200 and which extends downwards at an angle ⁇ 5 ( FIG. 4 C ) relative to horizontal surface 400 .
- This “dogleg” configuration increases the overall size of first dipole arm 200 , while at the same time “folding” the vertical surface 405 downwards to add mechanical rigidity to first dipole arm 200 and to better fit arm 200 within spatial constraints of the device housing within which the dipole antenna structure 100 is to be placed.
- the horizontal surface 400 of first dipole arm 200 may have a length L alh ( FIG.
- the vertical surface 405 of first dipole arm 200 may have a length L alv ( FIG. 4 B ) that ranges from 36.5 mm to 37.1 mm and a vertical surface width W alv ( FIG. 4 B ) that ranges from 8.9 mm to 9.5 mm.
- length L alh may be 54.2 mm
- width W alh may be 5.0 mm
- length L alv may be 36.8 mm
- width W alv may be 9.2 mm.
- the angle ⁇ 5 ( FIG. 4 C ) formed between vertical surface 405 and horizontal surface 400 of dipole arm 200 may range from about 89 degrees to about 91 degrees. In the implementation depicted in FIGS. 4 A- 4 C , angle ⁇ 5 may be 90 degrees.
- the second dipole arm 205 may have a length L a2 ( FIG. 4 A ) that ranges from 33.2 mm to 33.8 mm, and a width W a2 ( FIG. 4 A ) of an upper surface that ranges from 5.4 mm to 6.0 mm.
- the second dipole arm 205 may have a length L a2 of 33.5 mm, and a width W a2 of the upper surface of 5.7 mm.
- the tuning of the frequency response of antenna structure 100 may include first adjusting the length L alh of dipole arm 200 , which is relatively tolerant to dimensional changes as compared to arm 205 , followed by adjusting the length L a2 of dipole arm 205 . Small dimensional adjustments of length L alh of arm 200 and length L a2 of arm 205 may then iteratively be made until a balanced solution, that includes a frequency response having the desired frequency bands, is achieved.
- Cantilevered structure 210 ( FIG. 4 B ) of dipole antenna structure 100 serves to provide cantilevered structural support for dipole arms 200 and 205 .
- Cantilevered structure 210 includes an arm support beam 300 ( FIG. 4 B ) that connects to dipole arms 200 and 205 at one end of beam 300 , and connects to a cantilever beam 225 at another end of beam 300 .
- Cantilever beam 225 further connects to feed line 310 and ground line 305 ( FIG. 4 B ), which themselves connect to the underlying PCB (e.g., with a soldered connection to the PCB—not shown).
- a planar surface of dipole arm 200 may be formed in the sheet of metal 110 at an angle ⁇ 2 ( FIG. 4 B ) with a vertical planar surface of arm support beam 300 .
- Angle ⁇ 2 may range from about 89 degrees to about 91 degrees. In the implementation depicted in FIGS. 4 A- 4 C , angle ⁇ 2 may be 90 degrees.
- Arm support beam 300 may extend from an underside of second dipole arm 205 for a length L asb ( FIG. 4 B ) down to cantilever beam 225 .
- a planar surface of cantilever beam 225 may be formed in the sheet of metal 110 at an angle ⁇ 3 with the planar outer surface of arm support beam 300 .
- Angle ⁇ 3 may range from about 89 degrees to about 91 degrees. In the implementation depicted in FIGS. 4 A- 4 C , angle ⁇ 3 may be 90 degrees.
- Cantilever beam 225 may extend out a length L cbeam , from the lower end of arm support beam 300 , where length L cbeam may range from 6.55 mm to 7.15 mm. In the implementation depicted in FIGS. 4 A- 4 C , L cbeam may be 6.85 mm.
- Feed line 310 may be formed in the sheet of metal 110 at an angle ⁇ 4 ( FIG. 4 B ) with the underside of the planar surface of cantilever beam 225 .
- Angle ⁇ 4 may range from about 89 degrees to about 91 degrees.
- angle ⁇ 4 may be 90 degrees.
- Feed line 310 may have a width w fl ( FIG. 4 C ) and may extend a length L feed/gnd from an upper side of, on an outer edge of, cantilever beam 225 .
- L feed/gnd may range from 12.9 mm to 13.5 mm
- w fl may range from 1.7 mm to 2.3 mm.
- FIGS. 4 B angle ⁇ 4
- FIGS. 4 B angle ⁇ 4
- Feed line 310 may have a width w fl ( FIG. 4 C ) and may extend a length L feed/gnd from an upper side of, on an outer edge of, cantilever beam 225 .
- L feed/gnd may
- L feed/gnd may be 13.2 mm and w fl may be 2.0 mm.
- Ground line 305 may be spaced a consistent gap of G ( FIG. 4 C ) from feed line 310 , where G may range from 2.2 mm to 2.8 mm.
- Ground line 305 may have a width w gl ( FIG. 4 C ) and may extend a circuitous length L gl from ground connection 215 to a lower end of arm support beam 300 at a point where feed line 310 and cantilever beam 225 also may connect to arm support beam 300 .
- Width w gl may range from 1.7 mm to 2.3 mm and length L gl may range from 35.2 mm to 35.8 mm.
- gap G may be 2.5 mm
- width w gl may be 2.0 mm
- length L gl may be 35.5 mm.
- Impedance matching element 315 may be formed in the sheet metal 110 at an angle ⁇ 6 ( FIG. 4 C ) relative to a planar surface of cantilever beam 225 .
- Angle ⁇ 6 may range from about 89 degrees to about 91 degrees. In the implementation depicted in FIGS. 4 A- 4 C , angle ⁇ 6 may be 90 degrees.
- Impedance matching element 315 may include a roughly rectangular tab shape ( FIG. 4 B ) that extends downwards from a lower surface of cantilever beam 225 at the angle ⁇ 6 .
- Impedance matching element 315 has a length Lim ( FIG. 4 B ) that may range from 4.5 mm to 5.1 mm, and a width W im ( FIG.
- Impedance matching element 315 may “fold” downwards from an outer edge of cantilever beam 225 to more easily allow dipole antenna structure 100 , including cantilevered structure 210 , to fit within spatial constraints of the device housing in which dipole antenna structure 100 is to be placed.
- FIG. 5 illustrates interconnection of dipole antenna structure 100 with a PCB 500 that, among other components that possibly include additional antenna elements, includes circuitry for supplying signals to, and/or receiving signals from, dipole antenna structure 100 .
- dipole antenna structure 100 may connect to PCB 500 near an edge of PCB 500 such that, due to the cantilevered beam structure of dipole antenna structure 100 , the dipole arms 200 and 205 of the antenna structure 100 are cantilevered out and away from the underlying PCB 500 .
- FIG. 6 shows a wireless device 600 that includes a device housing 605 , inside of which the dipole antenna structure 100 and the PCB 500 may be placed.
- the shape and dimensions of housing 605 may vary based on the internal disposition and arrangement of dipole antenna structure 100 , PCB 500 , and other components of the device 600 .
- FIG. 7 further depicts a cutaway view of the internal space of the housing 605 of wireless device 600 , with one example of an internal arrangement of dipole antenna structure 100 , PCB 500 , and other components.
- PCB 500 may be located within housing 605 such that dipole antenna structure 100 , with its cantilevered beam structure, extends out and away from PCB 500 but still remains within the confines of the interior of housing 605 .
- FIG. 8 illustrates an example of the use of PCB potting to protect PCB 500 , and other components of wireless device 600 , in addition to providing mechanical support for dipole antenna structure 100 .
- PCB potting involves filling the housing 605 in, and around, PCB 500 and dipole antenna structure 100 with a liquid potting compound (e.g., epoxy, resin, polyurethane, silicone) that covers or submerges, or partially covers/submerges, PCB 500 and a portion of dipole antenna structure 100 and then dries and hardens to protect PCB 500 .
- a layer of PCB potting compound applied within the interior of device 600 provides a level of resistance to heat, chemicals, impacts, and other environmental hazards.
- PCB potting in the example of FIG.
- the PCB potting compound may be filled to a particular fill level within housing 605 .
- the PCB potting fill level within housing 605 may be set such that the effect of the PCB potting upon the frequency response of dipole antenna structure 100 may be minimized, in conjunction with the effect of impedance matching element 315 .
- FIG. 8 depicts a PCB potting maximum fill level 800 and a PCB potting minimum fill level 805 .
- the PCB potting compound may be poured into housing 605 and filled no higher than the PCB potting maximum fill level 800 so as to attempt to minimize the PCB potting's impact on the dipole antenna structure 100 's frequency response.
- the PCB potting compound may be filled to at least the PCB potting minimum fill level 805 to ensure adequate protection for the covered/submerged PCB 500 , and other components, and to provide sufficient mechanical support for the cantilevered structure 210 of antenna structure 100 which supports the dipole arms 200 and 205 of antenna structure 100 .
- the PCB potting's impact upon the frequency response of dipole antenna structure 100 may be minimized if the fill level of the PCB potting compound is kept within the PCB potting maximum fill level 800 and the minimum fill level 805 shown in FIG. 8 .
- the particular maximum and minimum fill levels for the PCB potting within housing 605 may vary based on a number of different factors, such as the particular physical arrangement of PCB 500 and dipole antenna structure 100 , and the multi-band frequencies for which the dipole antenna structure 100 is designed.
- FIGS. 9 A and 9 B depict plots 900 and 910 of Voltage Standing Wave Ratio (VSWR) versus frequency for an exemplary implementation of the dipole antenna structure 100 described herein.
- the x-axis of the plots of FIGS. 9 A and 9 B includes frequency, ranging from 650 MegaHertz (MHz) to 950 MHz in FIG. 9 A and ranging from 1.65 GigaHertz (GHz) to 2.35 GHz in FIG. 9 B .
- the y-axis of the plots includes VSWR ranging from 1.00 to 8.00 in FIG. 9 A and ranging from 1.00 to 5.00 in FIG. 9 B .
- the impedance of the transmitter/receiver and the transmission line must be well matched to the antenna's impedance.
- the VSWR parameter of an antenna numerically measures how well the antenna is impedance matched to the transmitter/receiver. The smaller an antenna's VSWR is, the better the antenna is matched to the transmitter/receiver and the transmission line, and the more power is delivered to/from the antenna.
- the minimum VSWR of an antenna is 1.0, at which no power is reflected from the antenna.
- Bandwidth requirements of antennas are typically expressed in terms of VSWR and a commonly adopted bandwidth specification is a 2:1 VSWR, meaning that the antenna has a range of frequencies (i.e., the impedance bandwidth) over which the antenna VSWR is less than or equal to two.
- a commonly adopted bandwidth specification is a 2:1 VSWR, meaning that the antenna has a range of frequencies (i.e., the impedance bandwidth) over which the antenna VSWR is less than or equal to two.
- the impedance bandwidth of the antenna would be 1.0 GHz to 1.3 GHz.
- Plot 900 of FIG. 9 A depicts a lower frequency band of an exemplary implementation of dipole antenna structure 100 .
- the lower frequency band (BW 1 ) at which the plotted VSWR is less than or equal to two spans a frequency range of f 1 equals 730 MHz to f 2 equals 790 MHz.
- the plot 910 of FIG. 9 B there are two higher frequency bands at which the VSWR is less than or equal to two.
- the second, higher frequency band (BW 2 ) spans a frequency range of f 3 equals 1.76 GHz to f 4 equals 1.89 GHz and the third, higher frequency band (BW 3 ) spans a frequency range offs equals 2.05 GHz to f 6 equals 2.27 GHz.
- the dipole antenna structure 100 's impedance is, therefore, in the exemplary implementation, well matched to the transmitter/receiver and the transmission line within the three frequency bands shown in FIGS. 9 A and 9 B .
- FIGS. 9 A and 9 B One skilled in the art will recognize, however, that the frequency bands depicted in FIGS.
- 9 A and 9 B may be changed based on changing dimensions of components of dipole antenna structure 100 , such as, for example, changing the length L alh of first dipole arm 200 , changing the length L a2 of second dipole arm 205 , and/or changing various dimensions of the components of the cantilevered structure 210 (e.g., ground line 305 , feed line 310 , impedance matching element 315 , cantilever beam 225 , arm support beam 300 ).
- the components of the cantilevered structure 210 e.g., ground line 305 , feed line 310 , impedance matching element 315 , cantilever beam 225 , arm support beam 300 .
- dipole antenna structure 100 may be adjusted based on varying the relative lengths, widths, angles, and/or thicknesses of the sheet metal antenna components described herein.
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Abstract
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US17/746,470 US11962102B2 (en) | 2021-06-17 | 2022-05-17 | Multi-band stamped sheet metal antenna |
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US202163211606P | 2021-06-17 | 2021-06-17 | |
US17/746,470 US11962102B2 (en) | 2021-06-17 | 2022-05-17 | Multi-band stamped sheet metal antenna |
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US20220416430A1 US20220416430A1 (en) | 2022-12-29 |
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Citations (60)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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2022
- 2022-05-17 US US17/746,470 patent/US11962102B2/en active Active
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Also Published As
Publication number | Publication date |
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MX2022007239A (en) | 2023-02-22 |
US20220416430A1 (en) | 2022-12-29 |
CA3161485A1 (en) | 2022-12-17 |
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